Patent classifications
C
CHEMISTRY; METALLURGY
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C07
ORGANIC CHEMISTRY
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C07D
HETEROCYCLIC COMPOUNDS
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309/00
Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings
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C07D309/34
having three or more double bonds between ring members or between ring members and non-ring members
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C07D309/36
with oxygen atoms directly attached to ring carbon atoms
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C07D309/38
one oxygen atom in position 2 or 4, e.g. pyrones
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